JPH0319648Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a lift-type check valve that is installed in a pumping pipe and prevents backflow of fluid.

<Prior art> A conventional lift-type check valve has a valve seat inside the valve box, and a valve body that is guided by a valve body guide and moves parallel to the valve seat. The valve seat was configured to open and close in response to the flow.

The valve body guide is screwed onto the upper part of the valve chamber by a threaded portion on the outer periphery of the upper part, and the valve body is connected to the valve body by a compressed coil-shaped spring interposed between the valve body guide and the valve body guide. In addition to being biased in the direction of closing the valve body, a flat contact member made of rubber or the like was attached to the part that engaged with the valve seat to perform a sealing action (such a lift type As an example of a check valve, there is, for example, Japanese Patent Application Laid-open No. 154565/1983).

In addition, Japanese Utility Model Application Publication No. 58-116876 discloses that an arm with a large passage area is suspended inward from the valve body at the outlet of the valve body, and a guide for the valve body is attached to the boss part of the arm in the downward direction as much as possible. A long check valve is disclosed. In this check valve as well, the tip of the arm extending from the upper part of the guide is screwed onto the upper part of the valve box.
A guide is attached to the valve box. <Problems to be solved by the invention> However, in the case of check valves with conventional configurations like this, it is difficult to attach the valve body when assembling the check valve, or to replace the valve body for repair. At the time, the valve body guide had to be rotated spirally many times to be attached and detached, making assembly and repair work complicated.

In addition, a large diameter threaded portion must be formed on the valve body guide and the valve chamber for screwing, resulting in an increase in cost.

Therefore, Japanese Patent Publication No. 54-11932 proposes a check valve in which a support bearing for supporting a valve body can be easily attached to a valve box. This check valve consists of a valve body with a valve seat on the inlet side, a valve body that cooperates with the valve seat, a spring that presses the valve body in the closing direction, and a rigid star-shaped support bearing for the spring. In a check valve in which the outer end of the rib of the support bearing is axially adjacent to a ring-shaped front wall provided with a radially protruding rib, the support bearing is placed at an angle at the outlet of the front wall. It is formed in such a shape that it can be inserted into the valve chamber through the opening, and when the rib is swung to the assembly position, the outer end of the rib comes into contact with the valve box and the support bearing does not come out of the valve chamber. a radial groove extending laterally in the front wall, the rib being axially supported and aligned with and engaged by the front chamber inner wall of the front wall and the outlet opening inner wall; The groove of the rib is configured to be engaged with and attached to a fixing means having a protruding surface and a curved portion provided to protrude radially into the opening of the front wall.

However, in the check valve with this configuration, the formation of large-diameter threaded parts on the valve body guide and valve body side is omitted, reducing costs, and the screwing work is avoided. I have a problem with the check valve assembly. That is, the valve body and spring, as well as the guide rod and support bearing of the valve body, are inserted into the valve chamber separately, and are assembled into one valve unit within the valve chamber. Moreover, it is necessary to fit the guide rod and the support bearing together, tilt them, and insert them into the valve chamber through the outlet opening. Therefore, assembly and repair work required skill and was extremely complicated.

<Means for solving the problem> This invention was devised to solve the above problem, and has a valve chamber that passes through the valve chamber, and an inlet at one end of the valve chamber that flows to the edge of the countryside. a valve box having an outlet; a valve seat provided on the inlet side of the valve chamber and perpendicular to the axis of the valve chamber; a valve body that opens and closes the valve seat; and a valve body that guides the valve body in the direction of its axis. A valve unit includes a guide and a compressed coil spring interposed between the valve body and the valve body guide, and the valve unit includes a plurality of springs extending from the valve body guide. A check valve in which a support arm is removably fitted to the upper part of the valve box, and the upper part of the valve chamber includes:
A plurality of sets of arm receivers are provided, each consisting of an upper protrusion and a lower protrusion that protrude toward the center beyond the opening diameter of the outlet, and the support arm of the valve unit is inserted and rotated from the outlet. The valve unit is fitted and engaged between an upper protrusion and a lower protrusion of the arm receiver, and at least one of the support arms and at least one of the arm receivers are engaged by a set screw. This is a check valve that is attached to the valve box mentioned above.

<Operation> This device is constructed as described above, and the valve unit is inserted into the valve chamber by aligning its axis with the axis of the outlet, moving straight in the axial direction, and aligning its axis with the axis of the outlet. By rotating around , the plurality of support arms of the valve body guide are fitted and engaged between the upper and lower protrusions of the plurality of arm receivers in the upper part of the valve chamber, and the support arms and the arms The receiving portion is locked with a set screw, and the valve unit is fixed to the valve box.

<Example> Hereinafter, an example of this invention will be shown in Figures 1 to 4.
This will be explained based on the diagram.

In the figure, 1 is a valve box that forms the outer shell of this check valve, and inside the box there is formed a valve chamber 3 whose cross section is approximately four-leaf clover-shaped. are provided on the same axis so that the fluid flows from the inlet 2 to the outlet 4. The four-leaf clover-shaped cross section of the valve chamber 3 is a shape given in order to avoid the connecting bolts at the flanges 6 and 7 and to increase the cross-sectional area of the valve chamber 3. If there are eight bulges, a cross-sectional shape with eight bulges is provided.

The valve seat 5 is formed downstream of the inlet 2 and perpendicular to the axis of the valve chamber 3 .

In the embodiment, the arm support portion 8 includes an upper protrusion 8a and a lower protrusion 8b that are arranged vertically at a predetermined interval, and between the upper protrusion 8a and the lower protrusion 8b,
A support arm 17, which will be described later, is formed to fit and engage. The four arm receivers 8 are connected to the valve chamber 3.
are formed at predetermined positions on the downstream side of the valve chamber 3 so as to protrude from each other toward the axis of the valve chamber 3 . Further, a female threaded portion 9 for screwing a set screw 27 is threaded into a predetermined arm receiving portion 8 .

The valve unit 10 includes a valve body 11 that opens and closes the valve seat 5.
The valve body guide 15 guides the valve body 11 in its axial direction, and the spring 20 is interposed between the valve body 11 and the valve body guide 15.

The valve body 11 is formed into a disk shape, and a rod portion 12 extending upward is integrally formed at the center thereof, and a contact member 13 is attached to the lower part of the valve body 11. The contact member 13 has elasticity, oil resistance,
An annular seat 14, which is made of high-carnitrile rubber or the like having excellent aging resistance and has a curved cross section, bulges downward, and is formed in an annular shape, is provided at the portion in pressure contact with the valve seat 5 surface.

The valve body guide 15 has a guide hole 16 formed in its axial center, through which the rod portion 12 is inserted and guides the valve body 11 in the axial direction, and the upper part of the guide hole 16 extends outward and has the above-mentioned arm receiving portion. 8 are provided with four support arms 17 which fit and engage. In addition, a predetermined support arm 1
A notch 19 corresponding to the above-mentioned female threaded portion 9 is provided at the tip of 7.

The spring 20 is a compression coil spring, and the spring 20 is a compression coil spring.
When the valve body 11 is inserted between the valve body 11 and the valve body guide 15, the valve body 11 is always urged downward.

Then, the spring 20 is fitted onto the rod portion 12,
When the rod portion 12 is fitted into the guide hole 16, the valve body 11, the valve body guide 15, and the spring 20 share the same axis, and the spring 20 is interposed between the valve body 11 and the valve body guide 15. A valve unit 10 is formed. This valve unit 10 is inserted into the valve chamber 3 by aligning its axis with the axis of the outlet 4 and moving it straight in the axial direction. Therefore, the notch 19 of a predetermined support arm 17 is made to correspond to the female threaded part 9, and the four support arms 17 are rotated about the axis of the valve unit 10 and fitted into the four arm receivers 8. They are then fitted and engaged (see Figure 4). and,
By screwing the set screw 27 into the female threaded portion 9, the set screw 27 is fitted into the notch portion 19, and the support arm 17 is fixed to the arm receiving portion 8.

The biasing force of the spring 20 is such that when the pumping water is at a predetermined flow rate and the valve body 11 is in the position shown by the two-dot chain line in FIG. 5 is set so as to close the valve seat 5, and a spring pressure is applied to fully open the valve seat 5 by the fluid pressure of the required amount of water pumped by the water pump.

Furthermore, between the inlet 2 and the valve chamber 3, a bypass valve 22, which is a normally closed valve for starting the pump, is provided.
It is provided together with a bypass valve seat 23 and a bypass passage 24.

Next, the operation of the check valve configured in this way will be explained.

First, the water pump operates and starts pumping water, and when a predetermined pumping amount is reached, the water pressure overcomes the biasing force of the spring 20 biasing the valve body 11 and pushes the valve body 11 upward. . At this time, the valve body 11 is
The rod portion 12 is guided into the guide hole 16,
Flow passages are opened between the valve seat 5 and the contact member 13 of the valve body 11 at equal intervals along the entire circumference of the valve body 11, rising parallel to the surface of the valve seat 5.

The pumped water flowing in from the inlet 2 is then transferred to the valve seat 5.
It then enters the valve chamber 3 and further flows to the outlet 4.
When the flow passes through the valve chamber 3, the flow resistance is low due to the valve chamber 3 having an expanded cross-sectional area in the shape of a four-leaf clover.
Low pressure loss.

Next, when the water pump suddenly stops due to a power outage, etc., the amount of water pumped in the pipe continues to decrease, eventually reaching zero, and finally begins to flow backwards. At this time, before backflow occurs, the valve body 11 closes the valve seat 5 without causing a closing delay due to the biasing force of the spring 20, thereby preventing the water hammer effect.

When the valve seat 5 is closed by the valve body 11, the valve seat 5
is engaged with the annular seat 14 of the valve body 11, and at this time,
The annular seat 14 absorbs compressive stress with its bulge having a curved cross section, and forms a sealed state due to the rebound resilience of the rubber.

It should be noted that this invention is not limited to the above-mentioned explanation and illustrations, and its embodiments can be modified within a range that does not depart from the technical idea of this invention. For example, it goes without saying that the cross-sectional shape of the close contact member of the valve body may be a commonly used flat plate configuration.

<Effects of the invention> As explained above, the check valve of this invention consists of a valve body having a penetrating valve chamber, an inlet at one end of the valve chamber and an outlet at the other end, and A valve seat provided on the inlet side and perpendicular to the axis of the valve chamber, a valve body that opens and closes the valve seat, a valve body guide that guides the valve body in the axial direction, and an intervening body between the valve body and the valve body guide. a valve unit made of a compressed coil-shaped spring installed therein, and the valve unit has a plurality of support arms extending from a valve body guide and removably fitted to the upper part of the valve box. This is a check valve, and the upper part of the valve chamber is provided with a plurality of sets of arm receivers each consisting of an upper protrusion and a lower protrusion that protrude toward the center beyond the opening diameter of the outflow port, and the support arm of the valve unit is The support arm is inserted through the outlet and rotated to fit and engage between the upper and lower protrusions of the arm receiver, and at least one of the support arms and at least one of the arm receivers are connected by a set screw. Since the valve unit is engaged with the valve body and attached to the valve body, the valve body, valve body guide, and spring can be preassembled outside the valve body to form the valve unit. The valve unit can be inserted straight into the valve chamber, and the support arm and arm receiver can be fitted and engaged by rotating the support arm by an amount equivalent to the width of the support arm, making it easy to fit and remove the valve unit. , the time required for assembly and repair can be reduced.

Further, the valve body guide support arm and its arm receiving portion for attaching the valve unit can be simply formed, and manufacturing costs can be reduced.

Furthermore, since the valve body guide is provided at the center of the valve body axis, the vertical sliding resistance of the valve body is small, so when the pump stops, the response of the valve body in the closing direction is extremely quick. This has the effect of preventing water hammer from occurring and preventing damage to the pipeline.

[Brief explanation of drawings]

Fig. 1 is a sectional view taken along the line A--A in Fig. 2 of a check valve according to an embodiment of this invention, and Fig. 2 is also a plan view.
FIG. 3 is a side view of the valve unit, and FIG. 4 is a plan view of the valve unit. 1...Valve box, 5...Valve seat, 8...Arm receiver, 10
... Valve unit, 11... Valve body, 15... Valve body guide, 17... Support arm, 20... Spring.

Claims (1)

[Claims for Utility Model Registration] A valve box having a penetrating valve chamber, an inlet at one end of the valve chamber and an outlet at the other end; and a valve provided on the inlet side of the valve chamber. A valve seat perpendicular to the axis of the chamber, a valve body that opens and closes the valve seat, a valve body guide that guides the valve body in the axial direction, and a compressor interposed between the valve body and the valve body guide. a valve unit made of a coiled spring; the valve unit is a non-return check in which a plurality of support arms extending from the valve body guide are removably fitted to the upper part of the valve body. In the valve, a plurality of sets of arm receiving portions each consisting of an upper protrusion and a lower protrusion that protrude toward the center beyond the opening diameter of the outlet are provided at the upper part of the valve chamber, and the supporting arm of the valve unit is inserted from the outlet and rotated to fit and engage between an upper protrusion and a lower protrusion of the arm receiver, and at least one of the support arms and at least one of the arm receiver 1. A check valve characterized in that said valve unit is attached to said valve box by being locked with a set screw.